public final class KoreanTokenizer extends Tokenizer
This tokenizer sets a number of additional attributes:
PartOfSpeechAttribute
containing part-of-speech.
ReadingAttribute
containing reading.
This tokenizer uses a rolling Viterbi search to find the least cost segmentation (path) of the incoming characters.
Modifier and Type | Class and Description |
---|---|
static class |
KoreanTokenizer.DecompoundMode
Decompound mode: this determines how the tokenizer handles
POS.Type.COMPOUND , POS.Type.INFLECT and POS.Type.PREANALYSIS tokens. |
static class |
KoreanTokenizer.Type
Token type reflecting the original source of this token
|
AttributeSource.State
Modifier and Type | Field and Description |
---|---|
static KoreanTokenizer.DecompoundMode |
DEFAULT_DECOMPOUND
Default mode for the decompound of tokens (
KoreanTokenizer.DecompoundMode.DISCARD . |
DEFAULT_TOKEN_ATTRIBUTE_FACTORY
Constructor and Description |
---|
KoreanTokenizer()
Creates a new KoreanTokenizer with default parameters.
|
KoreanTokenizer(AttributeFactory factory,
UserDictionary userDictionary,
KoreanTokenizer.DecompoundMode mode,
boolean outputUnknownUnigrams)
Create a new KoreanTokenizer.
|
Modifier and Type | Method and Description |
---|---|
void |
close()
Releases resources associated with this stream.
|
void |
end()
This method is called by the consumer after the last token has been
consumed, after
TokenStream.incrementToken() returned false
(using the new TokenStream API). |
boolean |
incrementToken()
Consumers (i.e.,
IndexWriter ) use this method to advance the stream to
the next token. |
void |
reset()
This method is called by a consumer before it begins consumption using
TokenStream.incrementToken() . |
void |
setGraphvizFormatter(GraphvizFormatter dotOut)
Expert: set this to produce graphviz (dot) output of
the Viterbi lattice
|
correctOffset, setReader
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString
public static final KoreanTokenizer.DecompoundMode DEFAULT_DECOMPOUND
KoreanTokenizer.DecompoundMode.DISCARD
.public KoreanTokenizer()
Uses the default AttributeFactory.
public KoreanTokenizer(AttributeFactory factory, UserDictionary userDictionary, KoreanTokenizer.DecompoundMode mode, boolean outputUnknownUnigrams)
factory
- the AttributeFactory to useuserDictionary
- Optional: if non-null, user dictionary.mode
- Decompound mode.outputUnknownUnigrams
- If true outputs unigrams for unknown words.public void setGraphvizFormatter(GraphvizFormatter dotOut)
public void close() throws java.io.IOException
Tokenizer
If you override this method, always call super.close()
, otherwise
some internal state will not be correctly reset (e.g., Tokenizer
will
throw IllegalStateException
on reuse).
NOTE:
The default implementation closes the input Reader, so
be sure to call super.close()
when overriding this method.
public void reset() throws java.io.IOException
TokenStream
TokenStream.incrementToken()
.
Resets this stream to a clean state. Stateful implementations must implement this method so that they can be reused, just as if they had been created fresh.
If you override this method, always call super.reset()
, otherwise
some internal state will not be correctly reset (e.g., Tokenizer
will
throw IllegalStateException
on further usage).
public void end() throws java.io.IOException
TokenStream
TokenStream.incrementToken()
returned false
(using the new TokenStream
API). Streams implementing the old API
should upgrade to use this feature.
This method can be used to perform any end-of-stream operations, such as setting the final offset of a stream. The final offset of a stream might differ from the offset of the last token eg in case one or more whitespaces followed after the last token, but a WhitespaceTokenizer was used.
Additionally any skipped positions (such as those removed by a stopfilter) can be applied to the position increment, or any adjustment of other attributes where the end-of-stream value may be important.
If you override this method, always call super.end()
.
end
in class TokenStream
java.io.IOException
- If an I/O error occurspublic boolean incrementToken() throws java.io.IOException
TokenStream
IndexWriter
) use this method to advance the stream to
the next token. Implementing classes must implement this method and update
the appropriate AttributeImpl
s with the attributes of the next
token.
The producer must make no assumptions about the attributes after the method
has been returned: the caller may arbitrarily change it. If the producer
needs to preserve the state for subsequent calls, it can use
AttributeSource.captureState()
to create a copy of the current attribute state.
This method is called for every token of a document, so an efficient
implementation is crucial for good performance. To avoid calls to
AttributeSource.addAttribute(Class)
and AttributeSource.getAttribute(Class)
,
references to all AttributeImpl
s that this stream uses should be
retrieved during instantiation.
To ensure that filters and consumers know which attributes are available,
the attributes must be added during instantiation. Filters and consumers
are not required to check for availability of attributes in
TokenStream.incrementToken()
.
incrementToken
in class TokenStream
java.io.IOException
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